Re: [w3c/ServiceWorker] Immediate Service Worker (#1389)

I might be miss something, but would it help to use push event when the worker needs to be update?
```javascript
onpush = e => { 
  if (NeedsUpdate(e.data)) {
    self.registration.update();
  }
}
```

It'll just work as the service worker's lifecycle, so I don't think we need a hack around the cache.
When unfortunately any of the tabs are opened when an update happens, we can ask to reload the page.

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